The movie story deals with Wealthy, powerful and influential Seth Dharamdas (Prem Nath) leads a financially secure life in a palatial bungalow. He is known to come help people who are beyond any hope of assistance, and this leads to him being known as "Dharmatma". But Seth Dharamdas does have a number of skeletons in his closet and a parallel life as a gangster and a matka king. The only person whom he dislikes and fears is his own son Ranbir (Feroz Khan).
After a heated argument over Dharmatma's matka business, Ranbir leaves home for Afghanistan, where he stays with his uncle and manages his business. One day in a forest while riding a horse, he finds a nomadic man named Jankura (Danny Denzongpa) and a woman named Reshma (Hema Malini) fighting. He defends beautiful Reshma and falls for her. Reshma too falls for him.
Meanwhile, in India, his sister Mona (Farida Jalal) is all set to marry Kundan, son of their father's old friend. She writes to Ranbir to attend her wedding and give them his blessings. Ranbir accepts her invitation and arrives at the venue. The marriage commences and Mona departs after the ceremony.
While in the car, she gives her husband a steel ring with "I Love You" inscribed on it. Ranbir leaves for Afghanistan. He proposes to Reshma, which she accepts. Her foster-father also reluctantly agrees to their marriage.
A fortune-teller there predicts that Reshma will bring death to Ranbir which has Reshma worried
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